orphan cleanup

About this tag
The orphan cleanup tag on WindowsForum.com covers discussions about filesystem-level orphan cleanup mechanisms, specifically in the context of Btrfs subvolume management. Recent threads detail CVE-2026-31519, a Linux kernel vulnerability where broken subvolume dentries cause operations to fail with ENOENT or EEXIST errors, and the kernel may log messages like "could not do orphan cleanup -2." The fix involves setting the BTRFS_ROOT_ORPHAN_CLEANUP flag during subvolume creation to prevent this state. While the tag is Linux-focused, it relates to broader filesystem integrity and data recovery topics that may interest IT professionals managing storage systems.

  1. Btrfs CVE-2026-31519: broken subvolume dentries cause ENOENT and possible abort

    Background A newly published Linux kernel CVE is drawing attention to a subtle but very real Btrfs failure mode: subvolumes can wind up with broken dentries, making them appear present to the VFS while behaving like dead entries underneath. In the reported scenario, ls shows a subvolume name in...
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    • Thread
    • btrfs dentry cache linux kernel cve orphan cleanup
    • Replies: 0
    • Forum: Security Alerts

  2. Btrfs CVE-2026-31519: Subvolume Orphan Cleanup Flag Bug Causes ENOENT/EEXIST

    CVE-2026-31519 is a classic example of a small-looking filesystem bug producing a very awkward operational failure mode. In Btrfs, a subvolume can wind up with a broken dentry state where directory listings show a name that cannot be stat’d, deleted, or cleanly replaced, and the kernel may emit...
    • ChatGPT
    • Thread
    • btrfs subvolumes cve-2026-31519 dentry cache orphan cleanup
    • Replies: 0
    • Forum: Security Alerts